After initially tinkering with each spell, you might start to think Rage is the only way to (or Jump if you’ve unlocked it). These spells are pretty powerful, and offer some huge strategic advantages, but they are also quite expensive and take a long time to create. Maybe you’ve forgotten, or given up on the Lightning spell because it seemed too weak.
Well it’s time for a second look. A 4+ star Lightning Spell will almost wipe out a level 4 – 5 mortar. If an opponent has placed a wizard tower or second mortar nearby, you can take out the pair with two spells. Wiping out critical splash damage defenses like this can allow your horde troops (barbs, archers, and goblins) to shred the remaining single target defenses.